INNO fibre optic temperature sensors ,temperature monitoring systems.
When installing and arranging temperature sensing optical fibers, attention should be paid to the detailed installation instructions in the fiber optic temperature measurement technology plan. The distributed fiber optic temperature measurement host system should contact FJINNO to request specific technical solutions.
Technical requirements for installation of temperature sensing optical fibers
Determine the fiber optic model and specifications according to system requirements, inspect the appearance of the fiber optic, and verify the technical indicators on the certificate of conformity; Store temperature sensing optical fibers in an upright cable tray to avoid fiber damage; When laying out optical fibers, a slender rod should be threaded through the center of the cable reel, and the cable reel should be laid flat to allow the optical fibers to rotate and lay out on the reel; At the end of the host, take out a 20m fiber optic cable and wrap it in a small circle with a diameter of 15cm; When the optical fiber passes through walls or pipes, it is not allowed to damage the detection optical fiber. If the pipeline through which the optical fiber passes is too long, it is necessary to ensure that multiple optical fibers pass through at once, and multiple optical fibers are not allowed to pass through in stages; The bending radius of the temperature sensing optical fiber shall not be less than 30mm; When laying optical fibers, it is not allowed to vigorously twist, stretch, or impact the fibers, and it is necessary to ensure that the fibers are intact and undamaged. When inserting flexible cables into optical fibers, the protective cap should be placed on the end face of the connector to provide protection; When laying optical fibers, it is necessary to leave 1 meter of fiber every 100 meters to avoid fiber damage; Each fiber optic wiring should leave a testing section, which is 20m fiber optic. An appropriate number of testing sections should be reserved according to the actual situation for system debugging.
Cable trench and cable corridor temperature sensing fiber optic construction, installation, and wiring
Lay temperature sensing optical fibers along the tested high-voltage cable and fix them on the high-voltage cable with flame-retardant ties. If it is necessary to monitor the temperature changes of multiple high-voltage cables simultaneously, an S-shaped wiring method can be adopted for the temperature sensing optical fiber to maximize the coverage of temperature measurement and save the use of temperature sensing optical fiber materials. In the temperature sensing fiber optic wiring of cable trenches and cable corridors, it is necessary to avoid external damage to the temperature sensing fiber optic, ensure that the fiber optic is intact and undamaged, and ensure that the fiber optic can accurately sense temperature and signal information; Due to the fact that temperature sensing optical fibers belong to quartz products, it is necessary to control the wiring curvature of temperature sensing optical fibers to ensure that their arc diameter is greater than 5cm, and to avoid reducing the accuracy of fiber optic temperature measurement due to too small an arc; Before installing the temperature measurement fiber optic connector, it is necessary to check whether the connector is clean and carry out construction in the order of laying the fiber optic cable first and then installing the connector.
The application of temperature sensing fiber optic system in high-voltage switchgear
The main sensing element of the cable optical fiber temperature measurement system is the temperature sensing optical fiber, which is equipped with non-metallic protective materials in the sensor housing and insulated thermal conductive ceramics are installed at the bottom of the sensor. By optimizing the design of the sensing components within the system, the high temperature resistance performance of the sensor can be improved, the volume of the sensor can be reduced, and it can be smoothly installed in the temperature monitoring area of the high-voltage switchgear.
How to install the fiber optic temperature measurement system for high-voltage switchgear cables
1. Fiber optic integration into cable trench
The temperature sensing optical fiber of the cable optical fiber temperature measurement system should be equipped with a silicone sheath, and the optical fiber itself is made of multi-mode quartz material, which enhances the insulation, pressure resistance, heat resistance, and corrosion resistance of the temperature sensing optical fiber. Install temperature sensing optical fibers on the static contacts of the high-voltage switchgear, and lead them out and merge them into the cable trench, so that the temperature sensing optical fibers can measure the temperature of other cables. During the maintenance process of the switchgear, there is no need to disassemble and assemble the temperature sensing fiber optic, and there is no problem of fiber optic winding. At the same time, it can ensure the cleanliness of the fiber optic transmission line.
2. Adding insulation devices
According to the test results of the National Wire and Cable Quality Inspection Center, one end of the cable fiber optic temperature measurement system was connected to the high-voltage part, and the other end was grounded at a distance of 30cm. There was no flashover phenomenon when a 95kV power frequency voltage was applied. It can be seen from this that installing a fiber optic temperature measurement system in the high-voltage switchgear will not affect the insulation safety of the switchgear. If the high-voltage switchgear is in an environment with high humidity, it is necessary to take moisture-proof measures when installing the cable fiber optic temperature measurement system. Insulation climbers should be installed on the relocated fiber optic to prevent water vapor from accumulating on the surface of the fiber optic, thereby minimizing the impact of harsh environments on the temperature measurement accuracy of the system.
In summary, there are relatively many tunnels along the railway line, and a large number of cables are laid in each tunnel. If the temperature of the cables is too high, it will accelerate the aging rate of insulation, which not only reduces the service life of the cables, but also increases the probability of faults, which is extremely detrimental to the safe operation of trains. To improve the operation and maintenance efficiency of cables in railway tunnels, fiber optic temperature measurement technology can be reasonably applied. In the specific application process, in addition to ensuring the effective connection of the fiber optic temperature measurement system, the installation quality of the system should also be ensured, only in this way can its function be fully realized.